From 1b86d90136efb98c7b331a84ca163587307a49af Mon Sep 17 00:00:00 2001
From: "yuuji.yaginuma" <yuuji.yaginuma@gmail.com>
Date: Thu, 17 May 2018 17:32:27 +0900
Subject: Enable `Performance/UnfreezeString` cop
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In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`.

```ruby
# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  gem "benchmark-ips"
end

Benchmark.ips do |x|
  x.report('+@') { +"" }
  x.report('dup') { "".dup }
  x.compare!
end
```

```
$ ruby -v benchmark.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Warming up --------------------------------------
                  +@   282.289k i/100ms
                 dup   187.638k i/100ms
Calculating -------------------------------------
                  +@      6.775M (± 3.6%) i/s -     33.875M in   5.006253s
                 dup      3.320M (± 2.2%) i/s -     16.700M in   5.032125s

Comparison:
                  +@:  6775299.3 i/s
                 dup:  3320400.7 i/s - 2.04x  slower

```
---
 railties/test/isolation/abstract_unit.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'railties/test/isolation')

diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index 96d21b3ae2..2a8c6d8f97 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -71,7 +71,7 @@ module TestHelpers
     end
 
     def extract_body(response)
-      "".dup.tap do |body|
+      (+"").tap do |body|
         response[2].each { |chunk| body << chunk }
       end
     end
-- 
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